100% codec coverage + disc/ and aacs/ module refactors
Codec coverage (DVD + BD + UHD): - E-AC-3 (Dolby Digital Plus): bsid detection, frame size calc — 8 tests - DTS-HD MA/HR: extension substream (0x64582025) detection — 8 tests - LPCM: BD header skip, raw PCM extraction — 6 tests - DVD VobSub subtitles: passthrough parser — 5 tests - Dolby Vision: verified RPU NAL type 62 preserved in HEVC — 1 test Module refactors: - disc.rs → disc/mod.rs + bluray.rs + dvd.rs + encrypt.rs - aacs/mod.rs (1661 lines) → mod.rs (21) + keydb.rs + keys.rs + decrypt.rs - All public APIs preserved, all tests pass 270 tests total, 0 failures.
This commit is contained in:
MattJackson
@@ -0,0 +1,945 @@
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//! AACS key resolution — VUK derivation, MKB processing, disc hash, unit key parsing.
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use super::decrypt::{aes_ecb_decrypt, aes_ecb_encrypt};
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use super::keydb::{DeviceKey, KeyDb};
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// ── VUK derivation ──────────────────────────────────────────────────────────
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/// Derive VUK from Media Key and Volume ID.
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/// VUK = AES-128-ECB-DECRYPT(media_key, volume_id) XOR volume_id
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pub fn derive_vuk(media_key: &[u8; 16], volume_id: &[u8; 16]) -> [u8; 16] {
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let mut vuk = aes_ecb_decrypt(media_key, volume_id);
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for i in 0..16 {
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vuk[i] ^= volume_id[i];
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}
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vuk
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}
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/// Decrypt an encrypted unit key using the VUK (AES-128-ECB).
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pub fn decrypt_unit_key(vuk: &[u8; 16], encrypted_uk: &[u8; 16]) -> [u8; 16] {
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aes_ecb_decrypt(vuk, encrypted_uk)
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}
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// ── Unit_Key_RO.inf parsing ─────────────────────────────────────────────────
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/// Parsed Unit_Key_RO.inf file.
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#[derive(Debug)]
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pub struct UnitKeyFile {
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/// Disc hash (SHA1 of the entire file) — used as KEYDB lookup key
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pub disc_hash: [u8; 20],
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/// Application type (1 = BD-ROM)
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pub app_type: u8,
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/// Number of BDMV directories
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pub num_bdmv_dir: u8,
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/// Whether SKB MKB is used
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pub use_skb_mkb: bool,
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/// Whether this is AACS 2.0
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pub aacs2: bool,
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/// Encrypted unit keys (CPS unit number, encrypted key)
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pub encrypted_keys: Vec<(u32, [u8; 16])>,
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/// Title → CPS unit index mapping (title_idx → unit_key_idx)
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pub title_cps_unit: Vec<u16>,
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}
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/// Compute disc hash (SHA1 of Unit_Key_RO.inf content).
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pub fn disc_hash(data: &[u8]) -> [u8; 20] {
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use sha1::{Digest, Sha1};
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let hash = Sha1::digest(data);
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let mut out = [0u8; 20];
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out.copy_from_slice(&hash);
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out
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}
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/// Format disc hash as hex string with 0x prefix (for KEYDB lookup).
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pub fn disc_hash_hex(hash: &[u8; 20]) -> String {
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let mut s = String::with_capacity(42);
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s.push_str("0x");
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for b in hash {
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s.push_str(&format!("{:02X}", b));
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}
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s
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}
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/// Parse Unit_Key_RO.inf from raw bytes.
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///
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/// Format (from AACS spec):
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/// [0..4] BE32: offset to key storage area (uk_pos)
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/// [16] app_type (1 = BD-ROM)
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/// [17] num_bdmv_dir
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/// [18] bit 7: use_skb_mkb
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/// [20..22] BE16: first_play CPS unit
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/// [22..24] BE16: top_menu CPS unit
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/// [24..26] BE16: num_titles
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/// [26..] title entries: 2 bytes padding + 2 bytes CPS unit, × num_titles
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///
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/// Key storage at uk_pos:
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/// [uk_pos..uk_pos+2] BE16: num_unit_keys
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/// [uk_pos+48..] encrypted keys, 16 bytes each
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/// AACS 1.0: 48-byte stride
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/// AACS 2.0: 64-byte stride (48 + 16 extra)
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pub fn parse_unit_key_ro(data: &[u8], aacs2: bool) -> Option<UnitKeyFile> {
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if data.len() < 20 {
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return None;
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}
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let hash = disc_hash(data);
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// Header
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let app_type = data[16];
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let num_bdmv_dir = data[17];
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let use_skb_mkb = (data[18] >> 7) & 1 == 1;
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// Key storage offset
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let uk_pos = u32::from_be_bytes([data[0], data[1], data[2], data[3]]) as usize;
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if uk_pos + 2 > data.len() {
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return None;
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}
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// Number of unit keys
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let num_uk = u16::from_be_bytes([data[uk_pos], data[uk_pos + 1]]) as usize;
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if num_uk == 0 {
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return Some(UnitKeyFile {
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disc_hash: hash,
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app_type,
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num_bdmv_dir,
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use_skb_mkb,
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aacs2,
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encrypted_keys: Vec::new(),
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title_cps_unit: Vec::new(),
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});
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}
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// Stride between keys
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let stride = if aacs2 { 64 } else { 48 };
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// Validate size
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let keys_start = uk_pos + 48; // first key at uk_pos + 48
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if keys_start + 16 > data.len() {
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return None;
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}
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// Extract encrypted keys
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let mut encrypted_keys = Vec::with_capacity(num_uk);
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let mut pos = keys_start;
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for i in 0..num_uk {
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if pos + 16 > data.len() {
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break;
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}
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let mut key = [0u8; 16];
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key.copy_from_slice(&data[pos..pos + 16]);
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encrypted_keys.push(((i + 1) as u32, key));
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pos += stride;
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}
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// Title → CPS unit mapping
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let mut title_cps_unit = Vec::new();
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if data.len() >= 26 {
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let first_play = u16::from_be_bytes([data[20], data[21]]);
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let top_menu = u16::from_be_bytes([data[22], data[23]]);
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let num_titles = u16::from_be_bytes([data[24], data[25]]) as usize;
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title_cps_unit.push(first_play);
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title_cps_unit.push(top_menu);
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for i in 0..num_titles {
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let off = 26 + i * 4 + 2; // 2 bytes padding + 2 bytes CPS unit
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if off + 2 <= data.len() {
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let cps = u16::from_be_bytes([data[off], data[off + 1]]);
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title_cps_unit.push(cps);
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}
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}
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}
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Some(UnitKeyFile {
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disc_hash: hash,
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app_type,
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num_bdmv_dir,
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use_skb_mkb,
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aacs2,
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encrypted_keys,
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title_cps_unit,
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})
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}
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// ── MKB processing ──────────────────────────────────────────────────────────
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/// Derive Media Key from MKB data using processing keys.
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///
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/// Processing keys are pre-computed keys that work for specific MKB versions.
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/// This is the fast path — no subset-difference tree traversal needed.
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///
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/// MKB format:
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/// Record type 0x10 = Verify Media Key Record (has mk_dv)
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/// Record type 0x81 = Type and Version Record (has MKB version)
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/// Record type 0x04 = Subset-Difference Index (has UVS entries)
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/// Record type 0x07 = Explicit Subset-Difference Record (has cvalues)
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pub fn derive_media_key_from_pk(mkb: &[u8], processing_keys: &[[u8; 16]]) -> Option<[u8; 16]> {
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// Parse MKB records
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let mk_dv = mkb_find_mk_dv(mkb)?;
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let uvs = mkb_find_subdiff_records(mkb)?;
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let cvalues = mkb_find_cvalues(mkb)?;
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// Count UV entries (each 5 bytes, stop when high bits set)
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let num_uvs = uvs
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.chunks(5)
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.take_while(|c| c.len() == 5 && (c[0] & 0xC0) == 0)
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.count();
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// Try each processing key against each UV/cvalue pair
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for pk in processing_keys {
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for i in 0..num_uvs {
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let uv = &uvs[1 + i * 5..]; // skip first byte
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let cv = &cvalues[i * 16..(i + 1) * 16];
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if let Some(mk) = validate_processing_key(pk, cv, uv, &mk_dv) {
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return Some(mk);
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}
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}
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}
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None
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}
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/// Validate a processing key against a cvalue/UV pair.
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/// Returns the Media Key if valid.
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fn validate_processing_key(
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pk: &[u8; 16],
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cvalue: &[u8],
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_uv: &[u8],
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mk_dv: &[u8; 16],
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) -> Option<[u8; 16]> {
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if cvalue.len() < 16 {
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return None;
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}
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// mk = AES-DEC(pk, cvalue) XOR cvalue
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let mut cv = [0u8; 16];
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cv.copy_from_slice(&cvalue[..16]);
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let mut mk = aes_ecb_decrypt(pk, &cv);
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for i in 0..16 {
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mk[i] ^= cv[i];
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}
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// Verify: AES-ECB(mk, mk_dv) should produce a specific pattern
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let _verify = aes_ecb_encrypt(&mk, mk_dv);
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// mk_dv verification: the first 12 bytes of AES(mk, mk_dv) should be all 0xDEADBEEF...
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// Actually per AACS spec: verify record value is AES(mk, all_zeros)
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// No — the mk_dv IS the verification value. We compute AES-ECB(mk, verify_data)
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// and check it matches.
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// From libaacs _validate_pk:
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// crypto_aes128d(pk, rec + a*16, mk) → decrypt cvalue with PK
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// mk[i] ^= rec[i] → XOR with cvalue
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// crypto_aes128e(mk, mk_dv, test) → encrypt mk_dv with derived mk
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// if first 12 bytes of test are zero → valid media key
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let test = aes_ecb_encrypt(&mk, mk_dv);
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// AACS spec: Verify Media Key record — first 12 bytes must be zero
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if test[..12] == [0u8; 12] {
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return Some(mk);
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}
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None
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}
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/// Find Verify Media Key Record (type 0x10) in MKB.
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fn mkb_find_mk_dv(mkb: &[u8]) -> Option<[u8; 16]> {
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let mut pos = 0;
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while pos + 4 <= mkb.len() {
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let rec_type = mkb[pos];
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let rec_len = u32::from_be_bytes([0, mkb[pos + 1], mkb[pos + 2], mkb[pos + 3]]) as usize;
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if rec_len < 4 || pos + rec_len > mkb.len() {
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break;
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}
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if rec_type == 0x10 && rec_len >= 20 {
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// mk_dv is at offset 4 (after record header)
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let mut dv = [0u8; 16];
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dv.copy_from_slice(&mkb[pos + 4..pos + 20]);
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return Some(dv);
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}
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pos += rec_len;
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}
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None
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}
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/// Find Subset-Difference records (type 0x04) in MKB.
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fn mkb_find_subdiff_records(mkb: &[u8]) -> Option<Vec<u8>> {
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let mut pos = 0;
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while pos + 4 <= mkb.len() {
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let rec_type = mkb[pos];
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let rec_len = u32::from_be_bytes([0, mkb[pos + 1], mkb[pos + 2], mkb[pos + 3]]) as usize;
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if rec_len < 4 || pos + rec_len > mkb.len() {
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break;
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}
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if rec_type == 0x04 && rec_len > 4 {
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return Some(mkb[pos + 4..pos + rec_len].to_vec());
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}
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pos += rec_len;
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}
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None
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}
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/// Find Conditional Values (cvalues) record (type 0x07) in MKB.
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fn mkb_find_cvalues(mkb: &[u8]) -> Option<Vec<u8>> {
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let mut pos = 0;
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while pos + 4 <= mkb.len() {
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let rec_type = mkb[pos];
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let rec_len = u32::from_be_bytes([0, mkb[pos + 1], mkb[pos + 2], mkb[pos + 3]]) as usize;
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if rec_len < 4 || pos + rec_len > mkb.len() {
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break;
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}
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if rec_type == 0x07 && rec_len > 4 {
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return Some(mkb[pos + 4..pos + rec_len].to_vec());
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}
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pos += rec_len;
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}
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None
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}
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/// Get MKB version from Type and Version Record (type 0x81).
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pub fn mkb_version(mkb: &[u8]) -> Option<u32> {
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let mut pos = 0;
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while pos + 4 <= mkb.len() {
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let rec_type = mkb[pos];
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let rec_len = u32::from_be_bytes([0, mkb[pos + 1], mkb[pos + 2], mkb[pos + 3]]) as usize;
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if rec_len < 4 || pos + rec_len > mkb.len() {
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break;
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}
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if rec_type == 0x81 && rec_len >= 8 {
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return Some(u32::from_be_bytes([
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mkb[pos + 4],
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mkb[pos + 5],
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mkb[pos + 6],
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mkb[pos + 7],
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]));
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}
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pos += rec_len;
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}
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None
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}
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// ── AACS-G3 key derivation (subset-difference tree) ─────────────────────────
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/// AACS-G3 seed constant.
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const AESG3_SEED: [u8; 16] = [
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0x7B, 0x10, 0x3C, 0x5D, 0xCB, 0x08, 0xC4, 0xE5, 0x1A, 0x27, 0xB0, 0x17, 0x99, 0x05, 0x3B, 0xD9,
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];
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/// AACS-G3: derive a subkey from a parent key.
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/// seed[15] += inc, then AES-DEC(key, seed) XOR seed.
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fn aesg3(key: &[u8; 16], inc: u8) -> [u8; 16] {
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let mut seed = AESG3_SEED;
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seed[15] = seed[15].wrapping_add(inc);
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let mut out = aes_ecb_decrypt(key, &seed);
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for i in 0..16 {
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out[i] ^= seed[i];
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}
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out
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}
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/// Compute v_mask from a UV value.
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fn calc_v_mask(uv: u32) -> u32 {
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let mut v_mask: u32 = 0xFFFFFFFF;
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while (uv & !v_mask) == 0 && v_mask != 0 {
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v_mask <<= 1;
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}
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v_mask
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}
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/// Derive processing key from device key using subset-difference tree traversal.
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fn calc_pk_from_dk(dk: &[u8; 16], uv: u32, v_mask: u32, dev_key_v_mask: u32) -> [u8; 16] {
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// Initial derivation: left_child = aesg3(dk, 0), pk = aesg3(dk, 1), right_child = aesg3(dk, 2)
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let mut left_child = aesg3(dk, 0);
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let mut pk = aesg3(dk, 1);
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let mut right_child = aesg3(dk, 2);
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let mut current_v_mask = dev_key_v_mask;
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while current_v_mask != v_mask {
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// Find the highest unset bit in current_v_mask
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let mut bit_pos: i32 = -1;
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for i in (0..32).rev() {
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if (current_v_mask & (1u32 << i)) == 0 {
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bit_pos = i;
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break;
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}
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}
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let curr_key = if bit_pos < 0 || (uv & (1u32 << bit_pos as u32)) == 0 {
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left_child
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} else {
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right_child
|
||||
};
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left_child = aesg3(&curr_key, 0);
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pk = aesg3(&curr_key, 1);
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right_child = aesg3(&curr_key, 2);
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current_v_mask = ((current_v_mask as i32) >> 1) as u32;
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}
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|
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pk
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}
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|
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/// Derive Media Key from MKB using device keys (subset-difference tree).
|
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pub fn derive_media_key_from_dk(mkb: &[u8], device_keys: &[DeviceKey]) -> Option<[u8; 16]> {
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let mk_dv = mkb_find_mk_dv(mkb)?;
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let uvs = mkb_find_subdiff_records(mkb)?;
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let cvalues = mkb_find_cvalues(mkb)?;
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// Count UV entries
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let num_uvs = uvs
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.chunks(5)
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.take_while(|c| c.len() == 5 && (c[0] & 0xC0) == 0)
|
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.count();
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for dk in device_keys {
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let device_number = dk.node as u32;
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|
||||
// Find applying subset-difference for this device
|
||||
for uvs_idx in 0..num_uvs {
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let p_uv = &uvs[1 + 5 * uvs_idx..];
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let u_mask_shift = uvs[5 * uvs_idx]; // byte before the UV value
|
||||
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if u_mask_shift & 0xC0 != 0 {
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break; // device revoked
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}
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let uv = u32::from_be_bytes([p_uv[0], p_uv[1], p_uv[2], p_uv[3]]);
|
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if uv == 0 {
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continue;
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}
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let u_mask: u32 = 0xFFFFFFFF << u_mask_shift;
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let v_mask = calc_v_mask(uv);
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if ((device_number & u_mask) == (uv & u_mask))
|
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&& ((device_number & v_mask) != (uv & v_mask))
|
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{
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// Found matching subset-difference — find the right device key
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||||
let dev_key_v_mask = calc_v_mask(dk.uv);
|
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let dev_key_u_mask: u32 = 0xFFFFFFFF << dk.u_mask_shift;
|
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if u_mask == dev_key_u_mask && (uv & dev_key_v_mask) == (dk.uv & dev_key_v_mask) {
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||||
// Derive processing key via tree traversal
|
||||
let pk = calc_pk_from_dk(&dk.key, uv, v_mask, dev_key_v_mask);
|
||||
|
||||
// Validate and derive media key
|
||||
if uvs_idx < cvalues.len() / 16 {
|
||||
let cv = &cvalues[uvs_idx * 16..(uvs_idx + 1) * 16];
|
||||
if let Some(mk) =
|
||||
validate_processing_key(&pk, cv, &uvs[1 + uvs_idx * 5..], &mk_dv)
|
||||
{
|
||||
return Some(mk);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
/// MKB disc structure format code.
|
||||
const MKB_DISC_STRUCTURE_FORMAT: u8 = 0x83;
|
||||
/// MKB pack buffer size.
|
||||
const MKB_PACK_SIZE: usize = 32772;
|
||||
|
||||
/// Read MKB from drive via SCSI (REPORT DISC STRUCTURE format 0x83).
|
||||
/// Returns the concatenated MKB data from all packs.
|
||||
pub fn read_mkb_from_drive(
|
||||
session: &mut crate::drive::DriveSession,
|
||||
) -> crate::error::Result<Vec<u8>> {
|
||||
use crate::scsi::{DataDirection, SCSI_READ_DISC_STRUCTURE};
|
||||
|
||||
let cdb = [
|
||||
SCSI_READ_DISC_STRUCTURE,
|
||||
0x01,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
MKB_DISC_STRUCTURE_FORMAT,
|
||||
(MKB_PACK_SIZE >> 8) as u8,
|
||||
(MKB_PACK_SIZE & 0xFF) as u8,
|
||||
0x00,
|
||||
0x00,
|
||||
];
|
||||
let mut buf = vec![0u8; 32772];
|
||||
session.scsi_execute(&cdb, DataDirection::FromDevice, &mut buf, 10_000)?;
|
||||
|
||||
let data_len = u16::from_be_bytes([buf[0], buf[1]]) as usize;
|
||||
if data_len < 2 {
|
||||
return Ok(Vec::new());
|
||||
}
|
||||
let len = data_len - 2;
|
||||
let num_packs = buf[3] as usize;
|
||||
|
||||
let mut mkb = Vec::with_capacity(32768 * num_packs.max(1));
|
||||
if len > 0 && len <= 32768 {
|
||||
mkb.extend_from_slice(&buf[4..4 + len]);
|
||||
}
|
||||
|
||||
// Read remaining packs
|
||||
for pack in 1..num_packs {
|
||||
let mut cdb = [
|
||||
SCSI_READ_DISC_STRUCTURE,
|
||||
0x01,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
0x00,
|
||||
MKB_DISC_STRUCTURE_FORMAT,
|
||||
(MKB_PACK_SIZE >> 8) as u8,
|
||||
(MKB_PACK_SIZE & 0xFF) as u8,
|
||||
0x00,
|
||||
0x00,
|
||||
];
|
||||
// Pack number goes in address field
|
||||
cdb[2] = ((pack >> 24) & 0xFF) as u8;
|
||||
cdb[3] = ((pack >> 16) & 0xFF) as u8;
|
||||
cdb[4] = ((pack >> 8) & 0xFF) as u8;
|
||||
cdb[5] = (pack & 0xFF) as u8;
|
||||
|
||||
let mut buf = vec![0u8; 32772];
|
||||
if session
|
||||
.scsi_execute(&cdb, DataDirection::FromDevice, &mut buf, 10_000)
|
||||
.is_ok()
|
||||
{
|
||||
let len = u16::from_be_bytes([buf[0], buf[1]]) as usize;
|
||||
if len > 2 && len - 2 <= 32768 {
|
||||
mkb.extend_from_slice(&buf[4..4 + len - 2]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(mkb)
|
||||
}
|
||||
|
||||
// ── Content Certificate parsing ─────────────────────────────────────────────
|
||||
|
||||
/// AACS Content Certificate — identifies disc AACS version and features.
|
||||
#[derive(Debug)]
|
||||
pub struct ContentCert {
|
||||
/// Bus encryption enabled flag
|
||||
pub bus_encryption: bool,
|
||||
/// Content Certificate ID (6 bytes)
|
||||
pub cc_id: [u8; 6],
|
||||
/// AACS version: false = AACS 1.0, true = AACS 2.0
|
||||
pub aacs2: bool,
|
||||
}
|
||||
|
||||
/// Parse a Content Certificate (ContentXXX.cer) file.
|
||||
pub fn parse_content_cert(data: &[u8]) -> Option<ContentCert> {
|
||||
if data.len() < 8 {
|
||||
return None;
|
||||
}
|
||||
|
||||
// Content Certificate format:
|
||||
// [0] certificate type (0x00 = AACS1, 0x01 = AACS2)
|
||||
// [1] bus_encryption_enabled (bit 0)
|
||||
// [2..8] cc_id (6 bytes)
|
||||
let aacs2 = data[0] != 0x00;
|
||||
let bus_encryption = (data[1] & 0x01) != 0;
|
||||
let mut cc_id = [0u8; 6];
|
||||
cc_id.copy_from_slice(&data[2..8]);
|
||||
|
||||
Some(ContentCert {
|
||||
bus_encryption,
|
||||
cc_id,
|
||||
aacs2,
|
||||
})
|
||||
}
|
||||
|
||||
// ── Full VUK resolution chain ───────────────────────────────────────────────
|
||||
|
||||
/// Result of resolving a disc's VUK.
|
||||
#[derive(Debug)]
|
||||
pub struct ResolvedKeys {
|
||||
/// Disc hash (SHA1 of Unit_Key_RO.inf)
|
||||
pub disc_hash: [u8; 20],
|
||||
/// Volume Unique Key
|
||||
pub vuk: [u8; 16],
|
||||
/// Decrypted unit keys (CPS unit number, key)
|
||||
pub unit_keys: Vec<(u32, [u8; 16])>,
|
||||
/// Title → CPS unit index mapping
|
||||
pub title_cps_unit: Vec<u16>,
|
||||
/// Whether AACS 2.0
|
||||
pub aacs2: bool,
|
||||
/// Whether bus encryption is enabled (from Content Certificate)
|
||||
pub bus_encryption: bool,
|
||||
/// Which resolution path succeeded (1=KEYDB, 2=KEYDB derived, 3=PK, 4=DK)
|
||||
pub key_source: u8,
|
||||
}
|
||||
|
||||
/// Resolve all AACS keys for a disc given:
|
||||
/// - Unit_Key_RO.inf raw data
|
||||
/// - Content Certificate raw data (optional, for AACS version detection)
|
||||
/// - Volume ID (from SCSI handshake)
|
||||
/// - KEYDB
|
||||
///
|
||||
/// Tries in order:
|
||||
/// 1. Disc hash → KEYDB → VUK (fast path)
|
||||
/// 2. KEYDB media key + volume ID → VUK (if disc hash not in KEYDB but MK is)
|
||||
/// 3. MKB + processing keys → media key → VUK (full derivation)
|
||||
pub fn resolve_keys(
|
||||
unit_key_ro_data: &[u8],
|
||||
content_cert_data: Option<&[u8]>,
|
||||
volume_id: &[u8; 16],
|
||||
keydb: &KeyDb,
|
||||
mkb_data: Option<&[u8]>,
|
||||
) -> Option<ResolvedKeys> {
|
||||
// Detect AACS version
|
||||
let aacs2 = content_cert_data
|
||||
.and_then(parse_content_cert)
|
||||
.map(|cc| cc.aacs2)
|
||||
.unwrap_or(false);
|
||||
|
||||
let bus_encryption = content_cert_data
|
||||
.and_then(parse_content_cert)
|
||||
.map(|cc| cc.bus_encryption)
|
||||
.unwrap_or(false);
|
||||
|
||||
// Parse Unit_Key_RO.inf
|
||||
let uk_file = parse_unit_key_ro(unit_key_ro_data, aacs2)?;
|
||||
|
||||
let hash_hex = disc_hash_hex(&uk_file.disc_hash);
|
||||
|
||||
// Helper to build result
|
||||
let build = |vuk: [u8; 16], key_source: u8| -> ResolvedKeys {
|
||||
let unit_keys: Vec<(u32, [u8; 16])> = uk_file
|
||||
.encrypted_keys
|
||||
.iter()
|
||||
.map(|(num, enc_key)| (*num, decrypt_unit_key(&vuk, enc_key)))
|
||||
.collect();
|
||||
ResolvedKeys {
|
||||
disc_hash: uk_file.disc_hash,
|
||||
vuk,
|
||||
unit_keys,
|
||||
title_cps_unit: uk_file.title_cps_unit.clone(),
|
||||
aacs2,
|
||||
bus_encryption,
|
||||
key_source,
|
||||
}
|
||||
};
|
||||
|
||||
// Path 1: Look up VUK by disc hash in KEYDB
|
||||
if let Some(entry) = keydb.find_disc(&hash_hex) {
|
||||
if let Some(vuk) = entry.vuk {
|
||||
return Some(build(vuk, 1));
|
||||
}
|
||||
}
|
||||
|
||||
// Path 2: Find entry with matching VID → derive VUK from MK + VID
|
||||
for entry in keydb.disc_entries.values() {
|
||||
if let (Some(mk), Some(did)) = (entry.media_key, entry.disc_id) {
|
||||
if did == *volume_id {
|
||||
return Some(build(derive_vuk(&mk, volume_id), 2));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Path 3: MKB + processing keys → media key → VUK
|
||||
if let Some(mkb) = mkb_data {
|
||||
if let Some(mk) = derive_media_key_from_pk(mkb, &keydb.processing_keys) {
|
||||
return Some(build(derive_vuk(&mk, volume_id), 3));
|
||||
}
|
||||
|
||||
// Path 4: MKB + device keys → processing key → media key → VUK
|
||||
if let Some(mk) = derive_media_key_from_dk(mkb, &keydb.device_keys) {
|
||||
return Some(build(derive_vuk(&mk, volume_id), 4));
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use super::super::decrypt::{aes_ecb_encrypt, ALIGNED_UNIT_LEN};
|
||||
use super::super::keydb::{DiscEntry, KeyDb};
|
||||
|
||||
/// Get KEYDB path from KEYDB_PATH environment variable. Returns None if not set or not found.
|
||||
fn keydb_path() -> Option<std::path::PathBuf> {
|
||||
let path = std::path::PathBuf::from(std::env::var("KEYDB_PATH").ok()?);
|
||||
if path.exists() {
|
||||
Some(path)
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_vuk_derivation() {
|
||||
// Civil War UHD: known MK, VID, VUK from KEYDB
|
||||
// MK = 15665F98..., VID (disc_id) = from entry, VUK = F96D7908...
|
||||
// VUK = AES-DEC(MK, VID) XOR VID
|
||||
let path = match keydb_path() {
|
||||
Some(p) => p,
|
||||
None => return,
|
||||
};
|
||||
|
||||
let db = KeyDb::load(&path).unwrap();
|
||||
|
||||
// Find a disc with both MK, disc_id, and VUK so we can verify derivation
|
||||
let entry = db
|
||||
.disc_entries
|
||||
.values()
|
||||
.find(|e| e.media_key.is_some() && e.disc_id.is_some() && e.vuk.is_some())
|
||||
.expect("No disc with MK + VID + VUK");
|
||||
|
||||
let mk = entry.media_key.unwrap();
|
||||
let vid = entry.disc_id.unwrap();
|
||||
let expected_vuk = entry.vuk.unwrap();
|
||||
|
||||
let derived = derive_vuk(&mk, &vid);
|
||||
assert_eq!(
|
||||
derived, expected_vuk,
|
||||
"VUK derivation failed for disc: {} (hash {})",
|
||||
entry.title, entry.disc_hash
|
||||
);
|
||||
eprintln!("VUK derivation verified for: {}", entry.title);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_decrypt_unit_key_from_vuk() {
|
||||
// Test the full chain: VUK → decrypt encrypted unit key → unit key
|
||||
// Use a known disc from KEYDB that has both VUK and unit keys
|
||||
let path = match keydb_path() {
|
||||
Some(p) => p,
|
||||
None => return,
|
||||
};
|
||||
|
||||
let db = KeyDb::load(&path).unwrap();
|
||||
|
||||
// Find a disc with VUK and unit keys
|
||||
let entry = db
|
||||
.disc_entries
|
||||
.values()
|
||||
.find(|e| e.vuk.is_some() && !e.unit_keys.is_empty())
|
||||
.expect("No disc with VUK + unit keys");
|
||||
|
||||
eprintln!(
|
||||
"Testing unit key decrypt for: {} ({})",
|
||||
entry.title, entry.disc_hash
|
||||
);
|
||||
eprintln!(" VUK: {:02X?}", entry.vuk.unwrap());
|
||||
for (num, key) in &entry.unit_keys {
|
||||
eprintln!(" Unit key {}: {:02X?}", num, key);
|
||||
}
|
||||
|
||||
// The unit keys in KEYDB are already decrypted — we can verify the chain
|
||||
// by encrypting with VUK and then decrypting
|
||||
let vuk = entry.vuk.unwrap();
|
||||
for (num, expected_uk) in &entry.unit_keys {
|
||||
let encrypted = aes_ecb_encrypt(&vuk, expected_uk);
|
||||
let decrypted = decrypt_unit_key(&vuk, &encrypted);
|
||||
assert_eq!(
|
||||
&decrypted, expected_uk,
|
||||
"Unit key {} roundtrip failed for {}",
|
||||
num, entry.title
|
||||
);
|
||||
}
|
||||
eprintln!(" All {} unit key roundtrips passed", entry.unit_keys.len());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_decrypt_real_unit() {
|
||||
// Try decrypting a real encrypted aligned unit from Civil War UHD
|
||||
// This disc is AACS 2.0 (BEE) so unit key alone won't work —
|
||||
// we need bus decryption first. But this verifies the pipeline.
|
||||
let unit_path = std::path::Path::new("/tmp/encrypted_unit.bin");
|
||||
if !unit_path.exists() {
|
||||
return;
|
||||
}
|
||||
|
||||
let original = std::fs::read(unit_path).unwrap();
|
||||
assert_eq!(original.len(), ALIGNED_UNIT_LEN);
|
||||
assert!(super::super::decrypt::is_unit_encrypted(&original), "Unit should be encrypted");
|
||||
|
||||
let kp = match keydb_path() {
|
||||
Some(p) => p,
|
||||
None => return,
|
||||
};
|
||||
let db = KeyDb::load(&kp).unwrap();
|
||||
|
||||
// Civil War UHD entries
|
||||
let civil_war_entries: Vec<&DiscEntry> = db
|
||||
.disc_entries
|
||||
.values()
|
||||
.filter(|e| e.title.contains("CIVIL WAR") && !e.unit_keys.is_empty())
|
||||
.collect();
|
||||
|
||||
eprintln!(
|
||||
"Found {} Civil War entries with unit keys",
|
||||
civil_war_entries.len()
|
||||
);
|
||||
|
||||
// Try each entry's unit keys
|
||||
for entry in &civil_war_entries {
|
||||
let keys: Vec<[u8; 16]> = entry.unit_keys.iter().map(|(_, k)| *k).collect();
|
||||
let mut unit = original.clone();
|
||||
|
||||
if let Some(idx) = super::super::decrypt::decrypt_unit_try_keys(&mut unit, &keys) {
|
||||
eprintln!(
|
||||
"SUCCESS: Decrypted with entry {} key {}",
|
||||
entry.disc_hash, idx
|
||||
);
|
||||
// Count TS sync bytes
|
||||
let ts = (0..32).filter(|&i| unit[4 + i * 192] == 0x47).count();
|
||||
eprintln!(" TS sync bytes: {}/32", ts);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
// Expected: none work because this is AACS 2.0 and needs bus decryption first
|
||||
eprintln!("No unit key worked (expected for AACS 2.0 BEE disc — needs read_data_key)");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_disc_hash() {
|
||||
// SHA1 of a known byte sequence
|
||||
let data = b"test unit key ro inf data";
|
||||
let hash = disc_hash(data);
|
||||
assert_ne!(hash, [0u8; 20]);
|
||||
// Same input → same hash
|
||||
assert_eq!(hash, disc_hash(data));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_disc_hash_hex() {
|
||||
let hash = [
|
||||
***REMOVED***,
|
||||
];
|
||||
let hex = disc_hash_hex(&hash);
|
||||
assert_eq!(hex, "***REMOVED***");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_unit_key_ro_synthetic() {
|
||||
// Build a synthetic Unit_Key_RO.inf
|
||||
// Header: uk_pos at offset 0 (BE32), points to key storage
|
||||
// Keys at uk_pos + 48 (16 bytes each, 48-byte stride for AACS 1.0)
|
||||
let mut data = vec![0u8; 256];
|
||||
|
||||
// uk_pos = 0x60 (96)
|
||||
data[0] = 0x00;
|
||||
data[1] = 0x00;
|
||||
data[2] = 0x00;
|
||||
data[3] = 0x60;
|
||||
|
||||
// Header fields at 16-18
|
||||
data[16] = 1; // app_type = BD-ROM
|
||||
data[17] = 1; // num_bdmv_dir
|
||||
data[18] = 0; // no SKB
|
||||
|
||||
// Title mapping at 20-25
|
||||
data[20] = 0;
|
||||
data[21] = 1; // first_play = CPS unit 1
|
||||
data[22] = 0;
|
||||
data[23] = 1; // top_menu = CPS unit 1
|
||||
data[24] = 0;
|
||||
data[25] = 1; // num_titles = 1
|
||||
// Title 0 entry: 2 bytes pad + CPS unit
|
||||
data[28] = 0;
|
||||
data[29] = 1; // CPS unit 1
|
||||
|
||||
// Key storage at offset 0x60
|
||||
let uk_pos = 0x60usize;
|
||||
data[uk_pos] = 0;
|
||||
data[uk_pos + 1] = 2; // 2 unit keys
|
||||
|
||||
// Key 1 at uk_pos + 48
|
||||
let key1_pos = uk_pos + 48;
|
||||
for i in 0..16 {
|
||||
data[key1_pos + i] = 0xAA;
|
||||
}
|
||||
|
||||
// Key 2 at uk_pos + 48 + 48
|
||||
let key2_pos = key1_pos + 48;
|
||||
for i in 0..16 {
|
||||
data[key2_pos + i] = 0xBB;
|
||||
}
|
||||
|
||||
let parsed = parse_unit_key_ro(&data, false).unwrap();
|
||||
assert_eq!(parsed.app_type, 1);
|
||||
assert_eq!(parsed.num_bdmv_dir, 1);
|
||||
assert!(!parsed.aacs2);
|
||||
assert_eq!(parsed.encrypted_keys.len(), 2);
|
||||
assert_eq!(parsed.encrypted_keys[0].0, 1); // CPS unit 1
|
||||
assert_eq!(parsed.encrypted_keys[0].1, [0xAA; 16]);
|
||||
assert_eq!(parsed.encrypted_keys[1].0, 2); // CPS unit 2
|
||||
assert_eq!(parsed.encrypted_keys[1].1, [0xBB; 16]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_mkb_version_parse() {
|
||||
// Synthetic MKB with Type and Version record (0x81)
|
||||
let mut mkb = vec![0u8; 32];
|
||||
// Record: type=0x81, length=12 (BE24)
|
||||
mkb[0] = 0x81;
|
||||
mkb[1] = 0x00;
|
||||
mkb[2] = 0x00;
|
||||
mkb[3] = 0x0C;
|
||||
// Version = 77
|
||||
mkb[4] = 0x00;
|
||||
mkb[5] = 0x00;
|
||||
mkb[6] = 0x00;
|
||||
mkb[7] = 77;
|
||||
|
||||
assert_eq!(mkb_version(&mkb), Some(77));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_resolve_keys_vuk_path() {
|
||||
// Test the full resolve chain using VUK path
|
||||
let path = match keydb_path() {
|
||||
Some(p) => p,
|
||||
None => return,
|
||||
};
|
||||
let db = KeyDb::load(&path).unwrap();
|
||||
|
||||
// Find V for Vendetta BD — has VUK and unit keys
|
||||
// hash: ***REMOVED***
|
||||
let entry = db.find_disc("***REMOVED***");
|
||||
if entry.is_none() {
|
||||
return;
|
||||
}
|
||||
let entry = entry.unwrap();
|
||||
let vuk = entry.vuk.unwrap();
|
||||
let vid = entry.disc_id.unwrap();
|
||||
|
||||
// We need the actual Unit_Key_RO.inf from the disc to compute disc hash.
|
||||
// Since we don't have it, we can at least test that the KEYDB lookup
|
||||
// works with a known hash.
|
||||
let hash_hex = "***REMOVED***";
|
||||
let found = db.find_disc(hash_hex);
|
||||
assert!(found.is_some());
|
||||
assert_eq!(found.unwrap().vuk, Some(vuk));
|
||||
|
||||
// Verify VUK derivation if we have MK + VID
|
||||
if let Some(mk) = entry.media_key {
|
||||
let derived = derive_vuk(&mk, &vid);
|
||||
assert_eq!(derived, vuk, "VUK derivation mismatch for V for Vendetta");
|
||||
eprintln!("V for Vendetta VUK derivation verified");
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_content_cert_parse() {
|
||||
// AACS 1.0 cert
|
||||
let mut data = vec![0u8; 16];
|
||||
data[0] = 0x00; // AACS 1.0
|
||||
data[1] = 0x00; // no bus encryption
|
||||
let cc = parse_content_cert(&data).unwrap();
|
||||
assert!(!cc.aacs2);
|
||||
assert!(!cc.bus_encryption);
|
||||
|
||||
// AACS 2.0 with bus encryption
|
||||
data[0] = 0x01; // AACS 2.0
|
||||
data[1] = 0x01; // bus encryption enabled
|
||||
let cc = parse_content_cert(&data).unwrap();
|
||||
assert!(cc.aacs2);
|
||||
assert!(cc.bus_encryption);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user